Предмет: Математика, автор: arianna21s

36cos2a если Cosa=2/3

Ответы

Автор ответа: pororoshkaPRO

1

36cos(2a)=36*(2cos²a-1)=36*(2*(2/3)²-1)=36*(2*(4/9)-1)=36*((8/9)-1)=-36*1/9=-4
-4

pororoshkaPRO: ответ:-4

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